This is the current situation…(this is a an old cask iron slop sink that came with the house.)
There was a leak and we thought it was the p-trap…so we decided to get a PVC one.
The other pipes are metal.
After we connected the p-trap, there's still a leak…but I can't tell exactly where it is.
It could be the metal pipe connection to the sink's drain. You can see that at the top with all the goop around it. I can actually jiggle that joint. (I wonder if it is threaded or they just added enough goop to make a connection (LOL).
Do I need to add thread sealant, pvc tape, etc to all the joints? You can wee that we added some to the joint that connects the p-trap to the wall pipe.
Can this setup work?
Can I use something like this to transition between PVC and metal pipe?
Update
I ordered a new free standing plastic utility sink and will attempt to connect that to the existing pipe in the wall
Best Answer
I would dismantle completely that metal downpipe from the sink, clean all that crud off it, then reassemble using the jointing so it seals between the sink and the drain grille.
All that exterior sealer will always fail as the water has already got past the proper seal. Done properly it will not leak, assuming none of the components are cracked or damaged.